node ../../bin/texts.js --from json --to xelatex
<<<
["text",
  ["para", { "level": 0 },
    ["math", "\\frac{1}{x}"]
  ],
  ["formula", { "level": 0 },
    ["plain", "\\frac{1}{x} \\text{for $|x|<1$}"]
  ]
]
>>>
$\frac{1}{x}$

\begin{equation}
\frac{1}{x} \text{for $|x|<1$}
\end{equation}